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2. Inventories (Tables)
 6 Months Ended
Jun. 30, 2015
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current [Table Text Block] The components of inventories are:

   
June 30,
   
December 31,
   
2015
   
2014
   
(In thousands)
           
Raw materials and purchased component parts
  $ 6,445     $ 6,183
Work-in-process
    1       4
Finished goods
    4,521       5,619
    $ 10,967     $ 11,806